exploratorium was one of the first hands on science exhibitions in the country. we were just there with the kids about a month ago. there is so many things to do and hands-on learning, it's the best. today is free. >> it is 4:37. we want to take advantage of mike nicco. i know one word, we need you mike. >> okay, yeah. >> for information. >> i don't have any money, what else do you want? let's talk about spare the air. poorest air quality in the santa clara valley once again, but all of us are under spare the air and possibly again tomorrow. so no burning of any type of wood. other big story, freeze warning in the north bay, mid 20s until 9:00. frost advisory for the bayshore line and santa clara valley, temperatures in the low 30s through 9:00. keep the pets in and plants protected until that time. once we get passed that, by noon mostly sunny and upper 40s. low to mid-50s by 4:00, so slightly warmer than yesterday. clouds will lead us to a chilly evening with upper 30s to mid 40s. as we head into thursday, friday and saturday, partly cloudy on thursday. slightl